I have 4x Timbernation solid maple platforms (2" thick). I then had solid brass rod legs machined to a spike by a CNC shop and cut to various lengths so each shelf is stackable on top of each other. It all weights a ton.
Had a few extra sets of brass rod legs done so if a taller amplifier is ever purchased I can put them in to raise one of the shelves.
Also purchased 2 extra Timbernation platforms to sit behind each speaker to hold the various tweaks, grounding boxes, network switches e.t.c
All up it cost me about $800 USD to get made, which was cheap when you consider how spectacular it looks. But this was 10 years ago and it will probably cost twice that amount now.